Logical Volume Management (LVM) Part-2
Continuation...... of Logical Volume Management.
Command options:
lvchange Change the attributes of logical volume(s)
lvconvert Change logical volume layout
lvcreate Create a logical volume
lvdisplay Display information about a logical volume
lvextend Add space to a logical volume
lvmchange With the device mapper, this is obsolete and does nothing.
lvmdisks can List devices that may be used as physical volumes
lvmsadc Collect activity data
lvmsar Create activity report
lvreduce Reduce the size of a logical volume
lvremove Remove logical volume(s) from the system
lvrename Rename a logical volume
lvresize Resize a logical volume
lvs Display information about logical volumes
lvscan List all logical volumes in all volume groups
# lvm - to enter into the logical volume mode
# lvrename - to rename the lv name
# lvremove - to delete the LV
# lvmdump - to collect all the information about LV’s, VG’s and PV’s
# lvmdiskscan - to see LV’s, VG’s and PV’s info with size
# lvs - to check logical volumes info
# lvcreate –size 100m –snapshot –name snap /dev/data/lv0 - creates a snapshot logical volume named /dev/data/snap which has access to the contents of the original logical volume named /dev/data/lv0 at snapshot logical volume creation time. If the original logical volume contains a file system, you can mount the snapshot logical volume on an arbitrary directory in order to access the contents of the file system to run a backup while the original file system continues to get updated.
# mkfs.ext3 /dev/data/lv0 - to make file system in lv
# mount <lv path> <mount point> - to mount the lv
To example of snapshot
To restore the snapshot data mount the snapshot to mount point and copy the files from snapshot to original path
In order to delete the logical volume
#umount /lv0
#lvremove /dev/data/lv0
#vgremove data
#pvremove /dev/sdb1
#pvremove /dev/sdb2
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